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Re: [RESEND] powerpc/numa: initialize distance lookup table from drconf path

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  Re: [RESEND] powerpc/numa: initialize distance lookup table from drconf path Michael Ellerman <mpe@ellerman.id.au> - 2015-08-20 01:20 +0200

#1210074 — Re: [RESEND] powerpc/numa: initialize distance lookup table from drconf path

On Thu, 2015-02-07 at 05:39:01 UTC, Nikunj A Dadhania wrote:
> In some situations, a NUMA guest that supports
> ibm,dynamic-memory-reconfiguration node will end up having flat NUMA
> distances between nodes. This is because of two problems in the
> current code.
> 
> 1) Different representations of associativity lists.
> 
>    There is an assumption about the associativity list in
>    initialize_distance_lookup_table(). Associativity list has two forms:
> 
>    a) [cpu,memory]@x/ibm,associativity has following
>       format:
>            <N> <N integers>
> 
>    b) ibm,dynamic-reconfiguration-memory/ibm,associativity-lookup-arrays
> 
>            <M> <N> <M associativity lists each having N integers>
>            M = the number of associativity lists
>            N = the number of entries per associativity list
> 
>    Fix initialize_distance_lookup_table() so that it does not assume
>    "case a". And update the caller to skip the length field before
>    sending the associativity list.
> 
> 2) Distance table not getting updated from drconf path.
> 
>    Node distance table will not get initialized in certain cases as
>    ibm,dynamic-reconfiguration-memory path does not initialize the
>    lookup table.
> 
>    Call initialize_distance_lookup_table() from drconf path with
>    appropriate associativity list.
> 
> Reported-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
> Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
> Acked-by: Anton Blanchard <anton@samba.org>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/1d805440a364b4a68562

cheers
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